Re: 3091 backend: Brightness, Contrast etc.

From: Ulrich Deiters (ukd@xenon.pc.Uni-Koeln.DE)
Date: Wed Mar 07 2001 - 23:32:48 PST

  • Next message: Marian Eichholz: "Re: 3091 backend: Brightness, Contrast etc."

    ... very interesting! My Canon FS 2710 does not seem to be able to
    set brightness, contrast, etc., too; perhaps it is a new fashion
    not to have these controls?

    If you have to do a minor adjustment of contrast, gamma, hue, etc.,
    doing it with the frontend or with a graphics editor program after
    scanning is OK and probably even more comfortable. But if you want
    to do a major correction, like brightening an underexposed photo,
    you will see colour fringes: Whereever the density curve is very
    steep, only very few input values are mapped to a wide range of
    output values. If the scanner is well designed, storing the density
    curve in the scanner eliminates this problem.

    Regards,

    Ulrich Deiters

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